0,5x(x – 3) = (x – 3)(1,5x – 1)

Đáp án:

`0,5x.(x - 3) = (x - 3).(1,5x - 1)`

`⇔ 0,5x.(x -3) - (x - 3).(1,5x - 1) = 0`

`⇔ (x- 3).[0,5x - (1,5x - 1)] = 0`

`⇔ (x - 3).(0,5x - 1,5x + 1) = 0`

`⇔ (x - 3).(1 - x) = 0`

`⇔`$\left[ \begin{array}{l}x - 3 = 0\\1 - x = 0\end{array} \right.$

`⇔`$\left[ \begin{array}{l}x = 3\\x = 1\end{array} \right.$

Vậy `S = {1;3}`

`#dariana`

`0,5x(x – 3) = (x – 3)(1,5x – 1)`

`<=> 0,5x(x-3) -(x-3)( 1,5x-1) =0`

`<=> (x-3) [0,5x-(1,5x-1)] =0`

`<=>(x-3) [ 0,5x-1,5x +1] =0`

`<=> (x-3 ). (-x+1) = 0`

`<=> x-3 = 0` hoặc `-x+1 =0`

`<=>  x=3` hoặc`x=1`

       Vậy `S = { 3;1}`